[ 38.444426][ T26] audit: type=1800 audit(1571670014.072:24): pid=7157 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.010359][ T26] audit: type=1800 audit(1571670014.732:25): pid=7157 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 39.055329][ T26] audit: type=1800 audit(1571670014.732:26): pid=7157 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.16' (ECDSA) to the list of known hosts. 2019/10/21 15:00:26 fuzzer started 2019/10/21 15:00:28 dialing manager at 10.128.0.105:39747 2019/10/21 15:00:28 syscalls: 2524 2019/10/21 15:00:28 code coverage: enabled 2019/10/21 15:00:28 comparison tracing: enabled 2019/10/21 15:00:28 extra coverage: extra coverage is not supported by the kernel 2019/10/21 15:00:28 setuid sandbox: enabled 2019/10/21 15:00:28 namespace sandbox: enabled 2019/10/21 15:00:28 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 15:00:28 fault injection: enabled 2019/10/21 15:00:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 15:00:28 net packet injection: enabled 2019/10/21 15:00:28 net device setup: enabled 2019/10/21 15:00:28 concurrency sanitizer: enabled syzkaller login: [ 52.848701][ T7312] ================================================================== [ 52.856868][ T7312] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 52.865098][ T7312] [ 52.867411][ T7312] read to 0xffff888126fd2408 of 4 bytes by interrupt on cpu 1: [ 52.874940][ T7312] __nf_ct_refresh_acct+0xd4/0x1b0 [ 52.880034][ T7312] nf_conntrack_tcp_packet+0xd40/0x3390 [ 52.885569][ T7312] nf_conntrack_in+0x410/0xa80 [ 52.890321][ T7312] ipv4_conntrack_in+0x27/0x40 [ 52.895078][ T7312] nf_hook_slow+0x83/0x160 [ 52.899482][ T7312] ip_rcv+0x12f/0x1a0 [ 52.903465][ T7312] __netif_receive_skb_one_core+0xa7/0xe0 [ 52.913635][ T7312] __netif_receive_skb+0x37/0xf0 [ 52.918561][ T7312] netif_receive_skb_internal+0x59/0x190 [ 52.924179][ T7312] napi_gro_receive+0x28f/0x330 [ 52.929015][ T7312] receive_buf+0x284/0x30b0 [ 52.933525][ T7312] virtnet_poll+0x436/0x7d0 [ 52.938018][ T7312] net_rx_action+0x3ae/0xa90 [ 52.942618][ T7312] __do_softirq+0x115/0x33f [ 52.947095][ T7312] [ 52.949417][ T7312] write to 0xffff888126fd2408 of 4 bytes by task 7312 on cpu 0: [ 52.957032][ T7312] __nf_ct_refresh_acct+0xfb/0x1b0 [ 52.962303][ T7312] nf_conntrack_tcp_packet+0xd40/0x3390 [ 52.967852][ T7312] nf_conntrack_in+0x410/0xa80 [ 52.972597][ T7312] ipv4_conntrack_local+0xbe/0x130 [ 52.977698][ T7312] nf_hook_slow+0x83/0x160 [ 52.982101][ T7312] __ip_local_out+0x1f7/0x2b0 [ 52.986761][ T7312] ip_local_out+0x31/0x90 [ 52.991090][ T7312] __ip_queue_xmit+0x3a8/0xa40 [ 52.995856][ T7312] ip_queue_xmit+0x45/0x60 [ 53.000255][ T7312] __tcp_transmit_skb+0xe81/0x1d60 [ 53.005347][ T7312] __tcp_send_ack+0x246/0x300 [ 53.010011][ T7312] tcp_send_ack+0x34/0x40 [ 53.014324][ T7312] tcp_cleanup_rbuf+0x130/0x360 [ 53.019166][ T7312] [ 53.021477][ T7312] Reported by Kernel Concurrency Sanitizer on: [ 53.027612][ T7312] CPU: 0 PID: 7312 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 53.035060][ T7312] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.045096][ T7312] ================================================================== [ 53.053140][ T7312] Kernel panic - not syncing: panic_on_warn set ... [ 53.059714][ T7312] CPU: 0 PID: 7312 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 53.067147][ T7312] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.077202][ T7312] Call Trace: [ 53.080486][ T7312] dump_stack+0xf5/0x159 [ 53.084713][ T7312] panic+0x210/0x640 [ 53.088618][ T7312] ? ip_queue_xmit+0x45/0x60 [ 53.093194][ T7312] ? vprintk_func+0x8d/0x140 [ 53.097769][ T7312] kcsan_report.cold+0xc/0x10 [ 53.102544][ T7312] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 53.108094][ T7312] __tsan_write4+0x32/0x40 [ 53.112516][ T7312] __nf_ct_refresh_acct+0xfb/0x1b0 [ 53.117631][ T7312] nf_conntrack_tcp_packet+0xd40/0x3390 [ 53.123171][ T7312] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 53.128791][ T7312] nf_conntrack_in+0x410/0xa80 [ 53.133668][ T7312] ipv4_conntrack_local+0xbe/0x130 [ 53.138767][ T7312] nf_hook_slow+0x83/0x160 [ 53.143173][ T7312] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 53.147936][ T7312] __ip_local_out+0x1f7/0x2b0 [ 53.152597][ T7312] ? constant_test_bit+0x30/0x30 [ 53.157515][ T7312] ip_local_out+0x31/0x90 [ 53.161923][ T7312] __ip_queue_xmit+0x3a8/0xa40 [ 53.166677][ T7312] ip_queue_xmit+0x45/0x60 [ 53.171096][ T7312] __tcp_transmit_skb+0xe81/0x1d60 [ 53.176211][ T7312] __tcp_send_ack+0x246/0x300 [ 53.180878][ T7312] tcp_send_ack+0x34/0x40 [ 53.185287][ T7312] tcp_cleanup_rbuf+0x130/0x360 [ 53.190134][ T7312] tcp_recvmsg+0x633/0x1a30 [ 53.194721][ T7312] inet_recvmsg+0xbb/0x250 [ 53.199118][ T7312] ? __tsan_read8+0x2c/0x30 [ 53.203620][ T7312] ? inet_sendpage+0x100/0x100 [ 53.208385][ T7312] sock_recvmsg+0x92/0xb0 [ 53.212715][ T7312] sock_read_iter+0x15f/0x1e0 [ 53.217381][ T7312] new_sync_read+0x389/0x4f0 [ 53.223096][ T7312] __vfs_read+0xb1/0xc0 [ 53.227260][ T7312] vfs_read+0x143/0x2c0 [ 53.231398][ T7312] ksys_read+0xd5/0x1b0 [ 53.235536][ T7312] __x64_sys_read+0x4c/0x60 [ 53.240026][ T7312] do_syscall_64+0xcc/0x370 [ 53.244520][ T7312] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.250392][ T7312] RIP: 0033:0x47c530 [ 53.254272][ T7312] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 53.273861][ T7312] RSP: 002b:000000c420169818 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 53.282259][ T7312] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 53.290228][ T7312] RDX: 0000000000001000 RSI: 000000c42009c000 RDI: 0000000000000003 [ 53.298182][ T7312] RBP: 000000c420169870 R08: 0000000000000000 R09: 0000000000000000 [ 53.306134][ T7312] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 53.314106][ T7312] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 53.323416][ T7312] Kernel Offset: disabled [ 53.327742][ T7312] Rebooting in 86400 seconds..